[AMDGPU] use llvm_unreachable instead of default for rp set

rampitec · rampitec · commit 4135077e2694 · 2020-02-24T12:02:12.000-08:00
GCC 9.2 seems to incorrectly issue warning about out of bounds access. This situation should not happen in any way. Differential Revision: https://reviews.llvm.org/D75071
diff --git a/llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp b/llvm/lib/Target/AMDGPU/SIRegisterInfo.cpp
@@ -1820,7 +1820,7 @@ unsigned SIRegisterInfo::getRegPressureSetLimit(const MachineFunction &MF,
     return getRegPressureLimit(&AMDGPU::SGPR_32RegClass,
                                const_cast<MachineFunction &>(MF));
 
-  return AMDGPUGenRegisterInfo::getRegPressureSetLimit(MF, Idx);
+  llvm_unreachable("Unexpected register pressure set!");
 }
 
 const int *SIRegisterInfo::getRegUnitPressureSets(unsigned RegUnit) const {

Original file line number	Diff line number	Diff line change
`@@ -1820,7 +1820,7 @@ unsigned SIRegisterInfo::getRegPressureSetLimit(const MachineFunction &MF,`
`1820`	`1820`	`return getRegPressureLimit(&AMDGPU::SGPR_32RegClass,`
`1821`	`1821`	`const_cast<MachineFunction &>(MF));`
`1822`	`1822`
`1823`		`- return AMDGPUGenRegisterInfo::getRegPressureSetLimit(MF, Idx);`
	`1823`	`+ llvm_unreachable("Unexpected register pressure set!");`
`1824`	`1824`	`}`
`1825`	`1825`
`1826`	`1826`	`const int *SIRegisterInfo::getRegUnitPressureSets(unsigned RegUnit) const {`